Improvement in injectors for boilers



nimh traits 'genet Afr.

JAMESGRESHAM, 0F MANCHESTEmGREAT Bm'rnm, -ASSIGNQR To 1R41' DIMOCK, 0FFLORENCE,MASSAGH'USETT Letters .Pant No. 74,345, dted Februaryll, 1838;patented in England, April 13, 1866.

IMPROVEMENT IN 'INJEGTORS PORBOIIERS.

'ro-ALL wnoM 1in-MAY coNcERN;

Be it known that I, JAMES GRESUAM, of the city o i' Manchester, intheooun'ty of Lancaster, inthe 'Uiiited v.Kingdom of Great :Britain :indIreland, linee invented a new und useful Iruprovenient'in oropplicnbleto that VApparatus for Raising and Forcing Fluids ond FeedingSteam-Boilers known v:is V Griil'zirds Injectom" 'and Indo herebydeclare the followingto be a. full, clear, and exact description-of;tlxe" some, reference b eing hudnt'o the accompanying sheetoidrnwings,` which forni o pai-tof this specilicntion, 'nndjtc lt-h'eletters of reference marled thereon.k l I The improvements 'to\ be'hereinafter s'pecied, thenghwhollyor partially applicable to variousclasses of injectors, can all he combinedtogether in one injector; and,an injector combining` such improvements is shown hy-gs. 1, 2., and 8 ofthe actolzupanying drawings. i

Figure 1- is u longitudin'al section,l Y

Figure 2 an en'd view, and V A'Figure 3 a detached sectional viewthrough the screw 'part of the central spindle', showing the spaces cutaway -for steamto pass. L y y 'l The rs't'pnrt' of' myizivention'-consists.infniiiohintionof parts" where the Isteam-nozzle issecured in the -end of a.. pipe or rain, into which the steam isconveyeddirectly, andwhich pipe or ram has a screw-cone spindle in it,'which ismade to nctalte the ram or pipe, toadjust the position of thesteam-nozzle, sfo as to open the steam space, and to regulate` thewater-space, by which combination gland-packings bctwen'the steam andwater (which frequently leak, andrender the' injector iiseless) aredispensedwith. l y

This part of my invention will be incre easily understood by referenceto the drawings.

, a is the ram, in thc end of which the steunt-nozzle b isscre'wed. Thisrom, @slides in and out of the other part, c, of the injector through agland-packing, el, which prevents the air'from entering, and the waterfrom escaping.` 1 dis a conespndlein'the centre of the ram @which lhasn. screw-boss, d1, on it,.that screws into a A'thread in the bore ofth'c ram dyes showm 'Thescrew-bossal1 upon the cone-'spindle has -spacesput away, as

'shown hy g. 3, to allow the steam to pass from the upperV part of thepipe or 'rem a to the steam-nozzle b. The

cone-spindle d passes through a smiling-gland, a, atzthe end of theremor pipea,l as shown; and the conespindle has s. bearing in a plate, dI,which is connected. with the lower part, c, of .the injector by tworods, d3,

one of which is shown, in peculiar dotted line, out of position, in'g'.1, there hengone upon eachside, as shown i'ii iig. 2. Thus arranged,fthe spindle can rotate, but cannot nieve endways ,-nn'd, consequently,when rotated by a handle, d, the ram a will he moved in and'ont,ahd,when moved inwards, the annular space for water will b c reduced,and thatfor steem'willbe increased,.snd vice versawhen tho ram is movedoutwards, The' combintionsahove'descrihed maybe used with the ordinaryform of cone, or with n. cone-spindle and a valve, which forms'aseparatepirt ofthe" invention, to beh'erein'after described. I'.lhosteam is runde to enter the ram a throughs hranch, t,n its 'sidia'nd mayheconveyedto it-by apipe socketed in a stullin'g-box4 to move inwardsund outwardsfinaflin' parallel to the movement of' the ram a,` or aswivel-jointed pipe may' he used to convey steam to the ram.; but :toneither of .these :i1-rangements do I `trinke :my claim.

Th'c second part of' )ny invention is np'plicsihlo` to` injectors` where'the rain or-steam-nozvzlo moves the l'cngthway. of the centralspindle-as in iig.A 1, or where the steam-nozzle is fixed, andthe'central spindle moved cndways; and it consists in arranging a rulre,d5, np'on the spindle ci, and a valve-facing or, seatingupon theinterior of the steam-nozzle b, as shown. By this construction orprovision, the steam can be regulated and shut off perfectly by means ofone handle, and thus' a separate cock orvalve is 'dispensed` with. Whenthe ordinary 'stopwalvc is employed, xm overilow or oriiice should beestablished at the junction of the ,two concs c c', so represented bydotted lines.; but 'this forms no part of the invention, n similarly orequivalently-disposed overflow hingcommon to othexyinjectors; Y -c isthe. branch in the -part c, through which water is hroughttotheinjector.

The third part' of my invention is used where the ordinaryovcrllow-oriiic'e'just referred to is dispensed with, and consists in amethod of opening and closing the outlet through which theiluid'canpsss, when starting the injector, this orifice being closedwhen the injector has got to work, and thus prevents the admission oi'air; and this -part of my invention is particularly useful when appliedto self-adjusting injectors. This portion of the vinvention consists ina modification of .the -ordinary stop-valve of injectors, so that, whenshut againsti'ts seating, itwill have to move some distance fromitsseating when vopening before there is suilicient space for the fluidto pass. This is done'by making it act likoa piston in a cylinder, thelength of the cylindrical part being varied according to the length ofmovement required. The stemh ,iof this valvc,f, has another small valve,g, uponA it, arranged to move upon the stem fl with play, so that thesmall valve-g will not shut until the stopf valvef begins to open, andso `that the small valve g will not begin to open before l-he stopwalvcfenters the cylindrical portion of its seat'. -The'tluid passing throughthe Vsmall valveg can escape through the pipe g. When the injector is tobe started, the steam andlluid will first escape through the small valveg, but, when' the injector-pressure becomes suiicient to overcome theboiler-pressure, the stop-valvefis moved, and, when it is' clear of thecylindrical part, the fluid can pass, and it is fully opened, by whichtime the small valve g is shut, and the escapiof iluidthrough the pipeg' is prevented, the injector being then fully at work. Thispistonaetion'of'the stop-valvefis the main feature of this part of myinvention, by which the necessary power is obtained for giving movementto the small valve with which itis connected. The valvefneed notlieiaper- -fectly water-tight t in the cylindrical part.

What I claim as my invention, and desire to secure by Letters Patent,is-4 v 1. 'The combination of the steam-ram a, carrying the steam-nozzleb, with a central spindle, d, whereby the steamA and water can beadjusted by turniug'the one handle dflsubstnntially as shown anddescribed. 2. The arrangement of the valve di' on the stem cl, incombination with the seat within th,e steam-ram a, substantially asdescribed. v

3. The valve'f, moving in a'cylinder,fz, for a portion of its travel,i'n combination with the valve g nflspindlef, arranged and operatingsubstantially as set forth.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

5 JAMES GREsHAM. Witnesses:

PETER-J. LINSEY, WMT GIFFARD.

